PAP5 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.4HG0336090, designated HvPAP5 (also known as HvSAG12), encodes a papain-like cysteine peptidase with thiol endopeptidase activity, belonging to the peptidase C1A family. In barley, this gene is associated with programmed cell death involved in cell development, floral organ senescence, and proteolysis, as well as responses to ethylene, cytokinin, auxin, gibberellin, fructose, glucose, and sucrose. It is linked to the MVA and MEP pathways, and localises to senescence-associated vacuoles, lysosomes, and protein storage vacuoles. Associations with grain filling period, photosynthetic rate, leaf senescence, seed yield, nitrogen remobilisation, drought resistance, and flooding tolerance have been noted. Studies of related genes in other species connect the family to developmental senescence, cadmium-induced programmed cell death, and saccharification efficiency.